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Verbal·Expression of Ideas·Transitions

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When constructing bridges with reinforced concrete, engineers anticipate that the material will develop cracks under heavy loads; the reinforcing lattice of steel bars embedded within the concrete is meant to accommodate this inevitability rather than thwart it entirely.        it is only upon cracking that reinforced concrete can actuate the full support of the steel. Until then, the steel’s role is largely passive, and the concrete behaves more or less like unreinforced concrete.

Which choice completes the text with the most logical transition?

A

Indeed,

B

However,

C

Nevertheless,

D

Thus,